noun
back-filling
Technical term in civil engineering and construction for filling the space behind a retaining wall, abutment, or similar structure with material such as soil, gravel, or concrete.
擁壁の裏込めには砕石が使われることが多い。
Crushed stone is often used for back-filling behind retaining walls.
裏込め材の選定は排水性を考慮して行う。
The selection of back-fill material is done with drainage in mind.